[migrations] use expression syntax for JSON default

[capcom6]

Summary by CodeRabbit

• Documentation

  • Clarified minimum supported database versions (MySQL 5.7.8+ or MariaDB 10.2.7+) across documentation and configuration examples
  • Recommended MariaDB LTS as the preferred deployment target

• Chores

  • Updated deployment and configuration documentation to reflect database compatibility requirements
  • Database schema migration for enhanced data storage

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: fd42bcb5-1b77-429d-9828-16450ef67a98

📥 Commits

Reviewing files that changed from the base of the PR and between b96fac6 and 87f43cf.

📒 Files selected for processing (4)

• .env.example
• README.md
• configs/config.example.yml
• deployments/helm-chart/README.md

📝 Walkthrough

Walkthrough

Documentation across README.md, .env.example, configs/config.example.yml, deployments/docker-compose/docker-compose.yml, and deployments/helm-chart/README.md is updated to specify MySQL 5.7.8+ or MariaDB 10.2.7+ as minimum supported versions and recommend MariaDB LTS. The sim_cards migration is also fixed to use DEFAULT ('[]') syntax for MariaDB JSON column compatibility.

Changes

MariaDB Compatibility Clarification and Migration Fix

Layer / File(s)	Summary
Database version requirements across docs and configs README.md, .env.example, configs/config.example.yml, deployments/docker-compose/docker-compose.yml, deployments/helm-chart/README.md	All user-facing documentation and example configs updated to state MySQL 5.7.8+ or MariaDB 10.2.7+ minimum versions and recommend mariadb:lts as the most-tested deployment target.
JSON DEFAULT syntax fix in sim_cards migration internal/sms-gateway/models/migrations/mysql/20260507035019_device_sim_cards.sql	DEFAULT '[]' changed to DEFAULT ('[]') for the sim_cards JSON column, using the parenthesized expression form required by MariaDB.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title '[migrations] use expression syntax for JSON default' directly describes the primary change in the MySQL migration file, where DEFAULT '[]' was changed to DEFAULT ('[]'). However, the PR also includes unrelated documentation updates to .env.example, README.md, config files, and Helm charts that clarify database version compatibility, which are not captured in the title.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In
`@internal/sms-gateway/models/migrations/mysql/20260507035019_device_sim_cards.sql`:
- Line 4: The migration attempts to set a DEFAULT value ('[]') on the sim_cards
JSON column, which is incompatible with MySQL 5.7.x where JSON columns cannot
have default values. Either update the minimum MySQL version requirement to
8.0.13+ in all documentation files (README.md, .env.example,
helm-chart/README.md) and deployment configurations, or remove the DEFAULT
('[]') clause from the sim_cards column definition in the migration and handle
the JSON default value at the application level when initializing device records
or querying them.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a695e37d-0a29-4d85-8837-850c661027a9

📥 Commits

Reviewing files that changed from the base of the PR and between f914877 and b96fac6.

📒 Files selected for processing (6)

• .env.example
• README.md
• configs/config.example.yml
• deployments/docker-compose/docker-compose.yml
• deployments/helm-chart/README.md
• internal/sms-gateway/models/migrations/mysql/20260507035019_device_sim_cards.sql

[github-actions]

🤖 Pull request artifacts

Platform	File
🐳 Docker	GitHub Container Registry
🍎 Darwin arm64	server_Darwin_arm64.tar.gz
🍎 Darwin x86_64	server_Darwin_x86_64.tar.gz
🐧 Linux arm64	server_Linux_arm64.tar.gz
🐧 Linux i386	server_Linux_i386.tar.gz
🐧 Linux x86_64	server_Linux_x86_64.tar.gz
🪟 Windows arm64	server_Windows_arm64.zip
🪟 Windows i386	server_Windows_i386.zip
🪟 Windows x86_64	server_Windows_x86_64.zip